Feedrate For Tapping With Compensating Chuck (G63); Fgroup And Fgref - Siemens SINUMERIK 840D Function Manual

Boundary conditions
Further overrides
The following overrides are inactive during rigid tapping
● Programmable path feedrate override OVR
● Rapid traverse override
5.2.5

Feedrate for tapping with compensating chuck (G63)

Function
G63 is a subfunction for tapping threads using a tap with compensating chuck. An encoder
(position encoder) is not required.
Speed S, feedrate F, thread pitch
With G63, a speed S must be programmed for the spindle and a feedrate F for the infeed axis
(axis for thread length).
The feedrate F must be calculated by the programmer on the basis of the speed S and the
thread pitch.
Feedrate F [mm/min] = speed S [rev/min] * pitch [mm/rev]
Further information
For more information on G63, see Programming Manual NC Programming.
5.2.6

FGROUP and FGREF

Programming
It should be possible to program the effective machining feedrate in the usual way as a path
feedrate via the F value in processing procedures where the tool, the workpiece or both are
moved by a rotary axis (e.g. laser machining of rotating tubes).
In order to achieve this, it is necessary to specify an effective radius (reference radius) for each
of the rotary axes involved. You can do this by programming the modal NC address:
FGREF[<rotary axis>]=<reference radius>
The unit of the reference radius depends on the G70/G71/G700/G710 setting.
In order to include the axes in the calculation of the path feedrate, they must all be specified in
the FGROUP command.
In order to ensure compatibility with the behavior with no FGREF programming, the evaluation
1 degree = 1 mm is activated on system powerup and RESET.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
V1: Feedrates
5.2 Path feedrate F
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